Rob Flinn said:As Dave says, a brass repairer is the person you need. I have friends who do this work & they have tools that are basically large ball bearings welded on to T bars. They have various different sizes I think that fit different diameter tubes, which they push down the tube with the ding, and it pushes it out from the inside. Some of the T bars are curved to allow them to get round bends. I think they perhaps have to do some work after this to remove slight creases that would still be there.
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